// Just the ID of the View defined in XML is not pretty useful
int theIDOfWhatIWantToLoad = R.id.answer;
/* But if we pass it to findViewbyID it returns us the View
* it is associated with.
* (findViewbyID returns a Object of the Type 'View') */
View v = this.findViewbyID(R.id.answer);
/* We know that it is a specialized View(a TextView),
* because we defined it in the main.xml .
* So we can cast it to TextView. */
TextView tv = (TextView)this.findViewbyID(R.id.answer);
// And set the Text it should show:
tv.setText("something");
// All in one line:
((TextView)this.findViewbyID(R.id.answer)).setText("something");